3. Fair Value of Financial Instruments (Details) - USD ($)	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016
Assets:
Cash and cash equivalents	$ 678,600	$ 1,025,100	$ 1,211,300	$ 1,245,000
Available for sale securities	309,100	295,500
Total	987,700	1,320,600
Liabilities:
Contingent consideration	600,000	297,000
Level 1
Assets:
Cash and cash equivalents	678,600	1,025,100
Available for sale securities	309,100	295,500
Total	987,700	1,320,600
Liabilities:
Contingent consideration	0	0
Level 2
Assets:
Cash and cash equivalents	0	0
Available for sale securities	0	0
Total	0	0
Liabilities:
Contingent consideration	0	0
Level 3
Assets:
Cash and cash equivalents	0	0
Available for sale securities	0	0
Total	0	0
Liabilities:
Contingent consideration	$ 600,000	$ 297,000